This is the first pass at making GetIPConfigs asynchronous.

chrome/browser/chromeos/cros/network_ip_config.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_CHROMEOS_CROS_NETWORK_IP_CONFIG_H_
 #define CHROME_BROWSER_CHROMEOS_CROS_NETWORK_IP_CONFIG_H_
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
+#include "base/callback.h"
 
 namespace chromeos {
 
 // ipconfig types (see flimflam/files/doc/ipconfig-api.txt)
 enum IPConfigType {
   IPCONFIG_TYPE_UNKNOWN,
   IPCONFIG_TYPE_IPV4,
   IPCONFIG_TYPE_IPV6,
   IPCONFIG_TYPE_DHCP,
   IPCONFIG_TYPE_BOOTP,  // Not Used.
@@ skipping 14 matching lines @@
   std::string device_path;  // This looks like "/device/0011aa22bb33"
   IPConfigType type;
   std::string address;
   std::string netmask;
   std::string gateway;
   std::string name_servers;
 };
 
 typedef std::vector<NetworkIPConfig> NetworkIPConfigVector;
 
+// Used to return the list of IP configs and hardware address from an
+// asynchronous call to Shill. The hardware address is usually a MAC address
+// like "0011AA22BB33". |hardware_address| will be an empty string, if no
+// hardware address is found.
+typedef base::Callback<void(const NetworkIPConfigVector& ip_configs,
+                            const std::string& hardware_address)>
+    NetworkGetIPConfigsCallback;
+
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_CROS_NETWORK_IP_CONFIG_H_